import { buffer2dbits, dataAddAlpha, dataRemoveAlpha, dbits2buffer, dbitsFill, imageDataUnScale } from "./imageEmbed"
import { dbitsUnFill } from "./imageEmbed"

export function imageUnEmbed(blob: Blob) {}

/**
 * 把编码过的像素数据转化为原始数据（为了高宽比，会填充 0，所以长度可能会与原数据不同）
 */
export function imageEmbedBufferRead(buffer: ArrayBuffer, options?: IImageEmbedBufferReadOptions) {
    if (options) {
        buffer = imageDataUnScale(
            {
                data: new Uint8ClampedArray(buffer),
                width: options.width,
                height: options.height,
            },
            options.blockSize
        ).data.buffer
    }

    buffer = dataRemoveAlpha(new Uint8ClampedArray(buffer)).buffer
    let dbits = buffer2dbits(buffer)
    let dbitsUnFilled = dbitsUnFill(dbits)
    let outBuffer = dbits2buffer(dbitsUnFilled)

    return outBuffer
}
export interface IImageEmbedBufferReadOptions {
    width: number
    height: number
    blockSize: number
}